DO NOT USE pest strips in the cages OR the same room. They have been known to cause permanent neurological problems in snakes. Damn... I remember when people were using that crap 10-20 years ago; people STILL use it?
Also using oils also had caused problems -- some people even had scales of their reptiles fell off after being applied!
Anyway
1) Give your snake a bath
2) Throw away the substrate, decor, EVERYTHING!
3) Bleach the cage
4) Rub your snake down with Ivory soap (it's the only thing that is safe without being overused or been known to cause problems; old time herpers been using Ivory soap for a long time)
You can also get some Prevent-a-Mite and use it on the cage as well; do not spray on the snake itself. Some people like to use Nix as well, but be WARNED that it is easy to overdose. Personally, I stay away from chemicals if I can. We do not know the long-term effect or what excessive repetitive use of these chemicals do to our animals. Now, before I bring my reptiles into the house, I rub them down with Ivory soap, give them a bath then put them into a quarantine room for at least 2 months if known to be from a safe collection; preferably 6 months minimum or a year for best result.